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cgroup: fix an error handling path in alloc_pagecache_max_30M() 

If the first goto is taken, 'fd' is not opened yet (and is un-initialized).
So a direct return is safer.

Link: https://lkml.kernel.org/r/628312312eb40e0e39463a2c06415fde5295c716.1653229120.git.christophe.jaillet@wanadoo.fr
Fixes: c1a31a2f7a ("cgroup: fix racy check in alloc_pagecache_max_30M() helper function")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Zefan Li <lizefan.x@bytedance.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: David Vernet <void@manifault.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christophe JAILLET 2022-05-22 16:18:51 +02:00 committed by akpm
parent 02e34fff19
commit 7fb6378701
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/cgroup/test_memcontrol.c
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@ -574,7 +574,7 @@ static int alloc_pagecache_max_30M(const char *cgroup, void *arg)
high = cg_read_long(cgroup, "memory.high");
max = cg_read_long(cgroup, "memory.max");
if (high != MB(30) && max != MB(30))
goto cleanup;
return -1;
fd = get_temp_fd();
if (fd < 0)